Subtract 15/7 from 90/18
1st number: 5 0/18, 2nd number: 2 1/7
90/18 - 15/7 is 20/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
90/18 = 90 × 7/18 × 7 = 630/126 - Likewise, for the 2nd fraction, since 7 × 18 = 126,
15/7 = 15 × 18/7 × 18 = 270/126 - Subtract the two like fractions:
630/126 - 270/126 = 630 - 270/126 = 360/126 - After reducing the fraction, the answer is 20/7
- In mixed form: 26/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/18-30/7 90/36-15/7 90/18-15/14 90/18-45/7 90/54-15/7 90/18-15/21 90/18-75/7 90/18-15/35 90/18-15/49